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Long-Term Nitrogen Addition Decreases Soil Carbon Mineralization in an N-Rich Primary Tropical Forest
| Content Provider | MDPI |
|---|---|
| Author | Lu, Xiankai Mao, Qinggong Wang, Zhuohang Mori, Taiki Mo, Jiangming Su, Fanglong Pang, Zongqing |
| Copyright Year | 2021 |
| Description | Anthropogenic elevated nitrogen (N) deposition has an accelerated terrestrial N cycle, shaping soil carbon dynamics and storage through altering soil organic carbon mineralization processes. However, it remains unclear how long-term high N deposition affects soil carbon mineralization in tropical forests. To address this question, we established a long-term N deposition experiment in an N-rich lowland tropical forest of Southern China with N additions such as $NH_{4}NO_{3}$ of 0 (Control), 50 (Low-N), 100 (Medium-N) and 150 (High-N) kg N $ha^{−1}$ $yr^{−1}$, and laboratory incubation experiment, used to explore the response of soil carbon mineralization to the N additions therein. The results showed that 15 years of N additions significantly decreased soil carbon mineralization rates. During the incubation period from the 14th day to 56th day, the average decreases in soil $CO_{2}$ emission rates were 18%, 33% and 47% in the low-N, medium-N and high-N treatments, respectively, compared with the Control. These negative effects were primarily aroused by the reduced soil microbial biomass and modified microbial functions (e.g., a decrease in bacteria relative abundance), which could be attributed to N-addition-induced soil acidification and potential phosphorus limitation in this forest. We further found that N additions greatly increased soil-dissolved organic carbon (DOC), and there were significantly negative relationships between microbial biomass and soil DOC, indicating that microbial consumption on soil-soluble carbon pool may decrease. These results suggests that long-term N deposition can increase soil carbon stability and benefit carbon sequestration through decreased carbon mineralization in N-rich tropical forests. This study can help us understand how microbes control soil carbon cycling and carbon sink in the tropics under both elevated N deposition and carbon dioxide in the future. |
| Starting Page | 734 |
| e-ISSN | 19994907 |
| DOI | 10.3390/f12060734 |
| Journal | Forests |
| Issue Number | 6 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-04 |
| Access Restriction | Open |
| Subject Keyword | Forests Soil Science Nitrogen Deposition Soil Carbon Mineralization Carbon Sequestration Soil Heterotrophic Respiration Microbial Activity Tropical Forests |
| Content Type | Text |
| Resource Type | Article |
